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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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S
Manus
S
Cartesia
S
TaglineAI search done right. Cited answers, not chat theater.Autonomous AI agent that actually finishes tasks.Ultra-low-latency voice. Built for realtime agents.
CategoryResearchAgentsVoice
PricingFree + $20/mo ProFree tier + $39-$199/moFree tier + usage-based API
Best forReplacing Google for any question where you want a cited answer in seconds.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Developers building voice agents, phone bots, interactive apps.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier in the agent category. The first one I'd give to a non-technical friend.S-tier for realtime. If latency matters more than voice catalog, start here.
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